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* v2.6.28-rc1: possible recursive locking detected
@ 2008-10-26 15:07 Vegard Nossum
  2008-10-28 23:00 ` Rafael J. Wysocki
  0 siblings, 1 reply; 2+ messages in thread
From: Vegard Nossum @ 2008-10-26 15:07 UTC (permalink / raw)
  To: LKML


I think that this wasn't my fault. It's v2.6.28-rc1+kmemcheck.

[ INFO: possible recursive locking detected ]
2.6.28-rc1 #58
cat/25690 is trying to acquire lock:
 (&hashbin->hb_spinlock){....}, at: [<c1780e1f>] irias_seq_show+0x3f/0x180

but task is already holding lock:
 (&hashbin->hb_spinlock){....}, at: [<c1780f95>] irias_seq_start+0x15/0x90

other info that might help us debug this:
2 locks held by cat/25690:
 #0:  (&p->lock){--..}, at: [<c0502545>] seq_read+0x25/0x2e0
 #1:  (&hashbin->hb_spinlock){....}, at: [<c1780f95>] irias_seq_start+0x15/0x90

stack backtrace:
Pid: 25690, comm: cat Not tainted 2.6.28-rc1 #58
Call Trace:
 [<c195b5d6>] ? printk+0x18/0x1a
 [<c048a0bb>] __lock_acquire+0xf0b/0xf80
 [<c044c8da>] ? kmemcheck_hide_addr+0x4a/0x60
 [<c042529b>] ? do_debug+0x3b/0x1b0
 [<c048a1a1>] lock_acquire+0x71/0xa0
 [<c1780e1f>] ? irias_seq_show+0x3f/0x180
 [<c195e636>] _spin_lock+0x36/0x60
 [<c1780e1f>] ? irias_seq_show+0x3f/0x180
 [<c1780e1f>] irias_seq_show+0x3f/0x180
 [<c050270c>] seq_read+0x1ec/0x2e0
 [<c0502520>] ? seq_read+0x0/0x2e0
 [<c05297ed>] proc_reg_read+0x5d/0x90
 [<c04ea749>] vfs_read+0x99/0x160
 [<c0529790>] ? proc_reg_read+0x0/0x90
 [<c04ea8cd>] sys_read+0x3d/0x70
 [<c0422f83>] sysenter_do_call+0x12/0x3f
 [<c0420000>] ? svm_intr_assist+0x90/0x1a0


"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036

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2008-10-26 15:07 v2.6.28-rc1: possible recursive locking detected Vegard Nossum
2008-10-28 23:00 ` Rafael J. Wysocki

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